Kowalczyk Jakub
Faculty of Civil and Transport Engineering, Institute of Machines and Motor Vehicles, Poznan University of Technology, 60-965 Poznan, Poland.
Materials (Basel). 2025 Apr 24;18(9):1946. doi: 10.3390/ma18091946.
Ultrasonic tests are widely used, both in laboratory and industrial settings, to assess the quality of joints, mainly welded joints. Studies are being carried out on the possibility of ultrasonic evaluation of adhesive joints. This study was conducted using signal analysis in the time and frequency domains. The ultrasonic probes used in the tests were selected on the basis of the properties of the test elements. For example, when testing welded joints, ultrasonic probes with a water delay line bounded by a thin diaphragm were used. Since adhesives have different acoustic properties, it is necessary to evaluate the capabilities of different ultrasonic probes to test adhesive joints. Tests were conducted for two different adhesives (cyanoacrylate and structural) and eight ultrasonic probes with a frequency range of 1.660 to 13.70 MHz. In the literature, no studies have analyzed the use of ultrasonic probes at such different frequencies. Frequency has the greatest effect on the attenuation of ultrasonic waves and the ultrasonic wavelength, and it was noted that the adhesive could cause a 25 percent change in the maximum frequency of the ultrasonic pulse. It was also found that it is necessary to make reference samples before ultrasonic testing of adhesive joints, since specific frequencies can produce erroneous signals for the selected adhesives.
超声波检测在实验室和工业环境中都被广泛用于评估接头质量，主要是焊接接头。目前正在开展关于对胶接接头进行超声波评估可能性的研究。本研究采用时域和频域信号分析方法进行。测试中使用的超声探头是根据测试元件的特性来选择的。例如，在检测焊接接头时，使用的是带有由薄隔膜界定的水延迟线的超声探头。由于胶粘剂具有不同的声学特性，因此有必要评估不同超声探头检测胶接接头的能力。针对两种不同的胶粘剂（氰基丙烯酸酯和结构型）以及频率范围为1.660至13.70 MHz的八个超声探头进行了测试。在文献中，尚无研究分析在如此不同频率下使用超声探头的情况。频率对超声波的衰减和超声波长影响最大，并且注意到胶粘剂可能会使超声脉冲的最大频率发生25%的变化。还发现，在对胶接接头进行超声波检测之前有必要制作参考样品，因为特定频率可能会为所选胶粘剂产生错误信号。
